ble_app_uart rx and tx characteristic uuid

[Fiske]

In ble_app_uart, the tx and rx characteristic uuid are shown below, and it supposed that the Tx characteristic enable notifications while the Rx characteristic enable write request and write command

#define BLE_UUID_NUS_TX_CHARACTERISTIC 0x0002                     
#define BLE_UUID_NUS_RX_CHARACTERISTIC 0x0003   

However, when I use a mobile app to access the characteristic, the mobile application shows that the UUID: 6E400003-B5A3-F393-E0A9-E50E24DCCA9E characteristic has notify properties, and UUID: 6E400002-B5A3-F393-E0A9-E50E24DCCA9E characteristic has write request and write command properties. When I write messaage to UUID: 6E400002-B5A3-F393-E0A9-E50E24DCCA9E, the data is output to uart port of the device. It seems that the Tx and Rx characteristic UUIDs are swapped. Please comment.

[Fiske]

I have checked the source code, and it seems that the Tx characteristic have write request and write command properties and the Rx characteristic have notify properties. It is swapped. Right?

[FormerMember]

What is RX and what is TX depends on which device it's seen from.

The RX characteristic has the notify property, and can indicate that the central will receive data from the peripheral. Similar for the TX characteristic.

I agree that the naming of the characteristics can be confusing.